No. The only possible conflict would be users sharing the same emails or usernames in which case the importer will prompt you to change the conflicting emails / usernames.

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Thanks Jake. As it turns out it was a SMF 2.0 forum. I used vB impex into vB 4 and then the very excellent vB 4 importer here at XF. It was a long road, but all of the posts and users have successfully transferred.